1-8
: 1s lead down middle & back up, remain in middle facing up as 2s & 3s
  step in behind 1s ready for ...
9-16
: 1s+2s+3s dance Promenade, 1s+2s remain in middle joining 2H with
  partner, 3s finish on sides
17-24
: 1s+2s dance Poussette
25-32
: 1s dance 1/2 Fig 8 (1L up round 2s, 1M down round 3s); all Adv+Ret 2
  steps with Bar 30: 1s changing places RH (2H popular) to retire to own
  sides.  2 1 3